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earthquake 3.5 bog problem

As the title says. Its runs awesome for 5 minutes. Then will bog as I try to give it full throttle. I have tuned many rc cars and this ones seems to be tuned dead nuts on. For the first 5 minutes I can go full throttle and no bog. Then out of nowhere it starts to bog. Any ideas or suggestions would be great.

Sounds like the engine has not reached operating temperature in the first 5 minutes and is tuned too lean for the temp at that point.
I found that the large nitro engines don't reach their operating temperatures in half a tank the long way. Same symptoms as yours.
Expect to warm the engine up in the first tank, then re-fill while running, and start you high speed tuning runs from there.

At this point you should probably richen up the HSN 1/2 to a full turn to make it past the 5 minute mark.